Die and die-stock



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f R. S4. BASCOM 8v N.E. MARTIN.

DIE AND DIE STOCK.

N0.'592.,044. Patented 001;-, 19, v1897.

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\ l w I 'UNITED STAT-HS PATENT- rnicn'l.

ROLLIN'S. BAScoM AND NATHAN E. MARTIN, or GHEENFILD, MASSACHUSETTS.

DIE AND DIE-STOCK.

SPECIFICATION forming part of Letters Patent No. 592,044, datedOctober 19, 1897.

' Application filed January 11, 1897- Serial No. 618,839. (No model.) I

To @ZZ whom it may concern.-

Be it known that we, ROLLIN S. BASCOM and NATHAN E. MARTIN,` citizens of the United States, residing at Greeneld, in the county of Franklin and State of Massachusetts, have invented certain new and useful Improvements in Dies and Die-Stocks, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to dies for threadcutting, and the object thereof is to 'provide j means for increasing the accuracy and efficiency of.the work performed as well as to increase the rapidity for doing the same.

The invention consists in the arrangement and constructionfof parts hereinafter Vdescribed, and particularly pointed out in the claims.

The invention is illustrated in the accompanying drawings, in which- Figure lis a plan view of the invention. Fig. 2 is a sectional view of the same. Fig. 3 is a detail View.

The die-stock is. of substantially the ordinary elastic construction, being provided with the central portion l, having the adjustable socket therein to receive the die, and the dia- Inetrically-extending handles 2. The die proper, 3, is of the well-known type provided with a tapered screw-threaded plug 4 for expanding the same. This adjustment of the die heretofore has been measured entirely by the eye or by suitable auxiliary instruments, which necessitated a waste of time. To overcome this objection., We arrange around the socket which receives the screw-threaded plug 4 a scale '5 and place a niche in the head of the plug to act as a pointer to register with one of the degrees of the scale. Thus in adj usting the plug the exact amount of contraction or expansion given to the die is at once apparent.

Around the bottom of the die-socket a narrow flange 7 is extendedinwardly, this flange having an upper inclined 'or beveled face, which provides a seat for a corresponding flange 8, formed on the guide-plate 9. This flange 8, which extends outwardly from the plate, is of slightlyless diameter than the minimum diameter of the die-socket, and thus the plate is held loosely therein. A guide-opening l0, extending centrally through this plate, corresponding to the thread-cutting opening 1l in the die, is adapted to exactly aline therewith.

lflange resting and supported on the flange 7 is in position, the die proper is inserted and rests upon this plate. The socket is then contracted to clamp the die, and this action presses the flange 7 against the flange 8 and forces the flat face of the plate 9 Ii'rmly against the face of the die, insuring and necessitating the opening l0 extending in perfect alinement with the opening l1, so that the object to be threaded will be accurately guided into the die.

We claim- 1. The combination with the die-stock having the die-socket, of a die held therein having a recess in the outer Wall thereof, a guideplate' having a corresponding recess and a stud extending transversely of said stock adjacent to said socket said stud having a portion thereof projectedinto said socket and adapted to fit the recesses in said die and plate, substantially as described.

2. In combination with the die-stock having a socket, with a beveled iiange extending inwardly around the edge of said socket, the die, the guide-plate having a correspondinglybeveled liange adapted to be seated on the flange of said die-stock, substantially as described.

3. The combination with the die-stock having an adjustable socket, of an annular flange 7 having a beveled upper face extending into said socket, the die, and the guide-plate having an outwardly-extending annular flange 8 of less diameter than said socket, said flange having a beveled face corresponding to the After the guide-plate, which IOO bevel-face of the flange 7 and adapted to be movably seated thereon, substantially as deseated thereon, substantially as described. scribed.

4. The combination with the die-stook hnv- In testimony whereof We affix our signaing an adj ustabie socket of en annular flange tures in presence of two Witnesses. 5 7 having t beveled upper face extending into Y, said socket, the die, and the guide-plate hzw- TIQIIIYS'FLQ ing an ontwnrdiy-extending annuler flange 8 l J' l l of less diameter than seid socket, said liange Witnesses: having a beveled face corresponding to the DANA MALONE, Io bevel-face of the iange 7 and adapted to be LESLIE II. STREETER. 

